Good morning, Forum! I've got a head-scratcher and am interested in the Forum's collective opinion! Important project parameters are as follows.
- 42-story high rise with an automatic standpipe - Seismic Design Category - C - IBC 2018 - Fire pump supplied by city water supply - Secondary supply, as required by IBC 403.3.3, is a tank of adequate size - 305 psi @ 1000 gpm pump sized based on the feed from tank - Direct-acting pressure reducing valves on each floor Here is my issue. If I base my PRV settings on city supply, I cannot get 100 psi at the remote valves when calculating tank as supply. If I base my PRV settings on tank supply, I am over 175 psi discharge on the valve when calculating city as supply. If I try to get my settings using the city as static and the tank as residual pressures, there is no PRV setting that works. I have my opinions about what I think should happen here, but I want to see what the Forum thinks. I will not bother the group with what the design team is suggesting I do. Micah Davis Ferguson Fire Design [email protected]
_________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]
